JavaScript - Functions
What is a function? A function is a set of instructions that performs a specific task, it can be called multiple times, optionally accept input parameters and return optional values. Functions improve code reuse by encapsulating functionality in self-contained blocks that can be invoked from different parts of a program. In JavaScript, the reserved word function is used to declare functions.
Basic syntax
function functionName(param1, param2, ...) { return value; }
Explanation of important elements
functionName() is the instruction to call the function. The curly braces { } contain the function definition.
Predefined functions and examples
console.log(welcome!) is an example of a predefined JavaScript function used to display messages in the console.
typeof is used to identify the data type of a variable. Example: let name = dharshini; console.log(typeof name)
BigInt type
BigInt is a data type designed to store very large integers that do not fit in a normal Number. Example: let y = 9999999999999999n
What return does
The return statement stops the execution of the function and returns a value to the place where the function was called. Example: function myFunction(name) { return Hello + name } console.log(myFunction(dharshini))
User input and messages
prompt is a built-in function that displays a dialog box requesting an input value from the user. Syntax: result = prompt(message, defaultValue). alert displays a modal dialog box with a message and an OK button, pausing execution until the user closes it. Example: alert(please enter valid input)
Best practices
Design small functions with a single responsibility, document parameters and return values, reuse functions to avoid duplication and handle errors and edge cases to keep code robust and maintainable.
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Happy coding and much success in your projects with JavaScript and functions
